Rome

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Pope Francis delivers his message on the occasion of an audience with participants of Rome's diocese convention in St. Peter's Square, at the Vatican, Sunday, June 14, 2015. (AP Photo/Gregorio Borgia)

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Pope Francis blesses the faithful as he arrives on the occasion of an audience with participants of Rome's diocese convention in St. Peter's Square, at the Vatican, Sunday, June 14, 2015. (AP Photo/Gregorio Borgia)

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A U.S. flag with a swastika is seen during a protest against a visit by President Bush in Rome, Friday June 4, 2004. Bush, who met Pope John Paul II at the Vatican Friday, is in Italy to celebrate the 60th anniversary of Rome's liberation and will proceed to France Saturday. (AP Photo/Andrew Medichini) **FILE**

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From left, Monsignor Francis J. Weber; Ruben Mendoza, professor in the Archaeology Program, Division of Social, Behavioral and Global Studies at California State University; Rose Marie Beebe, professor of Spanish literature at Santa Clara University; and Robert Senkewicz, professor of history at Santa Clara University, talk to the media during a panel of California scholars to discuss Spanish Franciscan friar Junipero Serra's life and legacy, in Rome, Thursday, April 30, 2015. (AP Photo/Andrew Medichini)

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Italian police officers patrol outside St. Peter's Square in Rome. Islamic extremists suspected in a bomb attack in a Pakistani market that killed more than 100 people had also planned an attack against the Vatican in 2010 that was never carried out, an Italian prosecutor said Friday. (Associated Press) ** FILE **

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In this April 2, 2015 pool photo Pope Francis, center, greets faithful after delivering a Holy Thursday homily in the Rebibbia prison chapel in Rome. Pope Francis washed the feet of 12 inmates and a baby at Rome's main prison Thursday in a pre-Easter ritual meant to show his willingness to serve. He asked them to pray that he, too, might be cleansed of his "filth." (AP Photo/L'Osservatore Romano, Pool)

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The Islamic State may be looking to turn more of Rome into ruins. (AP Photo)

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Galileo attempting to defend his belief in the heliocentric solar system before the Inquisition in Rome, 1633. Hand colored halftone of a 19th-century illustration. (North Wind Picture Archives via AP Images)

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Italian policemen clash with Feyenoord's fans at the Spanish steeps, in downtown Rome, prior to the Europa League soccer match between Roma and Feyenoord, Thursday, Feb. 19, 2015. (AP Photo/Gregorio Borgia)

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Marco Fois, of Italy, performs a 18-meter dive (59 feet) into the river Tiber from the Cavour Bridge in Rome, Thursday, Jan. 1, 2015, to celebrate the New Year. (AP Photo/Riccardo De Luca)

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Italian riot police officers patrol a street as they protect a refugee center in Rome's outskirts in November. The working-class neighborhood of Tor Sapienza has seen several nights of clashes by residents blaming foreigners for crimes. (Associated Press)

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Pope Francis attends a Vespers prayer in the Church of Jesus, in Rome, Saturday, Sept. 27, 2014. (AP Photo/Gregorio Borgia)

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Pope Francis met with Meriam Ibrahim, from Sudan, Thursday after her surprise release from her home country and a flight to Rome with her husband and two children. Ms. Ibrahim, whose estranged father was Muslim but whose mother was an Orthodox Christian from Ethiopia, was sentenced to death over charges of apostasy and was being held in U.S. Embassy in Khartoum, Sudan, until she was unexpectedly allowed to leave the country by Sudanese officials.